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Linux 3.13 compat: Handle __must_check bdi_setup_and_register 

torvalds/linux@8077c0d983 added a
__must_check to the bdi_setup_and_register(), which caused our autotools
check to break. zfsonlinux/zfs@729210564a
was intended to correct that, but it depended on -Wno-unused-result,
which is unrecognized in older GCC versions. That commit has been
reverted in favor of a solution that does not require
-Wno-unused-result.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2102
Closes #2135
This commit is contained in:
Richard Yao 2014-03-21 11:10:36 -04:00 committed by Brian Behlendorf
parent 6b6b8d1041
commit 1de1488fdc
1 changed files with 3 additions and 2 deletions
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5
config/kernel-bdi-setup-and-register.m4
View File

@ -1,6 +1,6 @@
dnl #
dnl # 2.6.34 API change
dnl # The bdi_setup_and_register() helper function is avilable and
dnl # The bdi_setup_and_register() helper function is avaliable and
dnl # exported by the kernel. This is a trivial helper function but
dnl # using it significantly simplifies the code surrounding setting
dnl # up and tearing down the bdi structure.
@ -10,7 +10,8 @@ AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER],
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
], [
bdi_setup_and_register(NULL, NULL, 0);
int r = bdi_setup_and_register(NULL, NULL, 0);
r = *(&r);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BDI_SETUP_AND_REGISTER, 1,